Hello.
Overall I think the site is interesting although its not my favorite design style.
The big text throughout the site is a bit of a turn-off for me.
I would left justify your text links throughtout. i.e in the groups section
I think the site accomplishes what you wish it to, but for me its a bit haphazzard in its design.

Overall the functionality is good and loads quickly for me.
I dont care for the menu that goes away. I would rather see the menu at all times. But thats just me.

Hope it helps.
3P

I.E 6 on windows XP
P4 3.06 GHZ, with 1 GB of ram